Hello,
The MPC5606E microcontroller integrates MPC5604E device with the Broadcom(R) BCM89810 single-port BroadR-Reach™ 100 Mbps automotive Ethernet transceiver. All information about configuration of the BCM89810 BroadR-Reach™ Ethernet transceivers is available at https://support.broadcom.com/.
The user should request for an account to access BCM89810 documentation, if the access is not there.
Regards,
Martin